Rattan’s sandmat Rattan’s sandmat

Euphorbia rattanii S. Watson, Proc. Amer. Acad. Arts 20: 372. 1885 (as rattani); Chamaesyce ocellata (Durand & Hilgard) Millspaugh subsp. rattanii (S. Watson) Koutnik; C. rattanii (S. Watson) Millspaugh; E. ocellata var. rattanii (S. Watson) L. C. Wheeler

Stems 10–22 cm, pilose. Leaves: stipules 1–1.5 mm, pilose; petiole 0.9–2 mm, pilose; blade 4.2–9.5 × 2.7–5 mm, apex acute to obtuse, surfaces pilose; lateral veins visible abaxially on larger leaves. Peduncle 1–2.2 mm. Involucre 2–2.5 × 1.7–2.4 mm, pilose; gland appendages present. Pistillate flowers: ovary pilose. Capsules 1.9–2.4 × 2–3.1 mm, pilose; columella 1.6–2 mm. Seeds pale gray to black, oblong, 1.6–1.7 × 0.8–1.2 mm, rugose.

Flowering and fruiting summer–fall, occasionally spring. Roadsides, gravelly or sandy dry stream beds; 80–500 m; Calif.

Subspecies rattanii occurs in the Sacramento Valley in Colusa, Glenn, and Tehama counties.